Hi, If you look at the rear cover, you will see 4 black discs covering up the 4 mounting holes. these are to be removed which will expose the 4 threaded fixing posts,
In some cases these covers are not fitted, and the 4 holes are exposed anyway.
Fitted in the holes in the back cover is a piece of plastic, this is to stop you cutting your fingers on the sharp edges of the back cover.
If you are fitting a third party bracket, ( a bracket not supplied by Panasonic)
It will come with a bag of various rings and spacers and washers,
Now the plastic bits fitted in the back cover, do NOT come flush to the back cover.They are recessed by about 1/8 inch,
You need to pad these out with washers, so that they become flush with the rest of the back cover and the back of the bracket, so that it lies flat to the back cover all the way down, and also where the fixing holes are.
The reason for this is there is a lot of force produced by using a thread. (car jack principle) if the washers are fitted as above, the studs will not be pulled back through the back cover as the small amount of travel will be stopped by the washers fitted.
Also it is importent not to use bolts that are too long, check the depth of the holes before fitting and make sure they go all the way without hitting the bottom if the post.
Remember, the studs are fitted directly to the screen. if you Overtighten them and pull them back through the back cover, we will see it on Ebay for spares only. good luck regards P